Lesson 2

Partition Shapes

Est. Class Sessions: 2–3

Teacher Notes

Use DPP item H to provide practice with the subtraction facts related to the addition facts in Group E.

14 − 4 = 10. 5 is one more than 4, so 14 − 5 is taking away one more, so 14 − 5 = 9.

Ongoing Assessment

Use DPP item H to assess students' fluency with the subtraction facts related to the addition facts in Group E [E10].

See the Letter Home for targeted practice ideas.

Becky Bright used a ten to solve 12 − 3. She said, "I know 12 − 2 = 10. So 12 minus 3 is taking away one more. 12 − 3 = 9."

Show or tell how to use Becky's strategy to solve 14 − 5.